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09-03-2015, 05:06 PM
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Join Date: Dec 2014
Location: Wellington, FL
Posts: 62
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IO-360 VS O360
Looking at buying an RV7-A. It seems that 8 out 10 have a carb'ed engine.
Other than cost, what advantage if any would there be putting a carb'ed engine in instead of an injected?
Positives I know for injected:
NO CARB HEAT worries.
Better fuel savings
Better power.
I don't know if one is better than the other for hot starts.
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09-03-2015, 05:23 PM
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Join Date: Mar 2008
Location: Reno NV
Posts: 542
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IO-360 VS O360
I recently changed my RV-9A from a carb engine to to a FI engine, both -360s. My experience is no carb heat concerns and more equal cyl and egt Temps. Other than that, the two are a wash, except hot starts. Dan
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09-03-2015, 05:53 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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If you want to do negative G acro, then the FI wins. Positive G acro and a carb is just fine.
As for the better power, I seem to recall one of the engine builders stating that with their dyno pull's, the carbs tend to do better numbers.
I wouldn't avoid an airplane because of the carb as you can always swap out the carb, if you want to.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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09-03-2015, 09:20 PM
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Join Date: Oct 2011
Location: Pilot Hill, CA
Posts: 845
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I understand carbs typically hot start better that FI.
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Charlie
RV-8
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09-04-2015, 04:40 AM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,692
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Hot starting an injection engine vs carb as an issue is about the same severity level as the difference between the horizontal injection snorkel intake vs the vertical intake air box FAB.
By that I mean that the snorkel is way better in many respects (maint, cowl removal, fod) but there are thousands of people happily flying the FABs
__________________
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
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09-04-2015, 05:42 AM
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Join Date: Dec 2014
Location: Wellington, FL
Posts: 62
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How hard is it to switch over to injected? I guess you would need a new manifold, and the injectors, injector pump etc.
Also price guess?
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09-04-2015, 05:46 AM
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Join Date: May 2005
Location: X35 - Ocala, FL
Posts: 3,679
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Quote:
Originally Posted by sheldon957
How hard is it to switch over to injected? I guess you would need a new manifold, and the injectors, injector pump etc.
Also price guess?
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You would need the injection servo, the spider (flow divider), the lines and the injectors. Then you would need to change the fuel system to high pressure, meaning the engine driven pump and the boost pump. Also, depending on the injection system you use, you may need a fuel return line going back to the tank. Total cost is probably about $4,000.
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Jesse Saint
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09-04-2015, 06:39 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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You will also need to replace most of the FWF fuel lines along with the throttle & mixture cables.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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09-04-2015, 08:43 AM
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Join Date: Dec 2005
Location: Ridgecrest, CA
Posts: 432
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Carb vs FI: Hot Starting Fuel Injected Aerosport 360
There may be valid reasons to continue the FI vs carb debate, but hot starting a FI 360 shouldn't be one of them. The credibility of that statement is the fact I've been flying my Aerosport IO-360 RV-8A out of Inyokern (IYK) in the Mojave desert for 4+ years and nearly 600 hrs. with summer OAT's regularly well over 100 deg. F.
Here's what works for me - so far every time:
Throttle - Full Fwd
RPM - Full Fwd
Mixture - ICO
Boost - OFF (DO NOT PRIME)
Starter - Engage
Mixture - Move out of ICO
Throttle - Adjust after start (Pay attention or you will quickly find yourself at full power)
Boost - On if evidence of vapor lock at idle until normal fuel flow established
There may be other procedures, but the key for me on hot re-starts is not to prime - any priming at all seems to flood the engine. I use this procedure regardless of OAT for restarts. For initial start, I prime with boost pump 5-6 seconds..
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09-04-2015, 08:55 AM
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Join Date: Oct 2011
Location: Pilot Hill, CA
Posts: 845
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Quote:
Originally Posted by pvalovich
There may be valid reasons to continue the FI vs carb debate, but hot starting a FI 360 shouldn't be one of them. The credibility of that statement is the fact I've been flying my Aerosport IO-360 RV-8A out of Inyokern (IYK) in the Mojave desert for 4+ years and nearly 600 hrs. with summer OAT's regularly well over 100 deg. F.
Here's what works for me - so far every time:
Throttle - Full Fwd
RPM - Full Fwd
Mixture - ICO
Boost - OFF (DO NOT PRIME)
Starter - Engage
Mixture - Move out of ICO
Throttle - Adjust after start (Pay attention or you will quickly find yourself at full power)
Boost - On if evidence of vapor lock at idle until normal fuel flow established
There may be other procedures, but the key for me on hot re-starts is not to prime - any priming at all seems to flood the engine. I use this procedure regardless of OAT for restarts. For initial start, I prime with boost pump 5-6 seconds..
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I'm going to give that a try. My experimentation has slowly trended that direction with better results as each time. Thanks
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Charlie
RV-8
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